using and auditing kernel config fragments

using and auditing kernel config fragments

[Tomas Frydrych]

Hi,

I am trying to add a kernel config fragment to the yocto 2.6.37 kernel
for BeagleBoard, because I need a driver for a rt2800usb dongle.

For some reason which I cannot work out, the rt2800usb options are
removed (rather then disabled) from the yocto kernel config, i.e., if I
run 'bitbake -c menuconfig linux-yocto', there is very little under
Drivers->Net->WLAN. If I run menuconfig in the devshell, there are lots
more WLAN drivers available, including the rt2800.

So, I created custom fragment with the appropriate options, which works
to the extent it gets picked up, but then the options are removed during
the kernel_configme process and end up in the missing_required.cfg, and
there is no information I can find anywhere in the logs as to why this
is the case. Any ideas how to find out what the problem is?

(I am using yocto master)

Tomas

Re: using and auditing kernel config fragments

[Autif Khan]

> For some reason which I cannot work out, the rt2800usb options are
> removed (rather then disabled) from the yocto kernel config, i.e., if I
> run 'bitbake -c menuconfig linux-yocto', there is very little under
> Drivers->Net->WLAN. If I run menuconfig in the devshell, there are lots
> more WLAN drivers available, including the rt2800.

Under Device Drivers -> Network device support -> Wireless LAN, You
have to enable Ralink driver support to see the options for
CONFIG_RT2800USB

It is not under Device Drivers -> Network device support -> Wireless LAN

It is under Device Drivers -> Network device support -> Wireless LAN
-> Ralink driver support

Re: using and auditing kernel config fragments

[Autif Khan]

>> For some reason which I cannot work out, the rt2800usb options are
>> removed (rather then disabled) from the yocto kernel config, i.e., if I
>> run 'bitbake -c menuconfig linux-yocto', there is very little under
>> Drivers->Net->WLAN. If I run menuconfig in the devshell, there are lots
>> more WLAN drivers available, including the rt2800.
>
> Under Device Drivers -> Network device support -> Wireless LAN, You
> have to enable Ralink driver support to see the options for
> CONFIG_RT2800USB
>
> It is not under Device Drivers -> Network device support -> Wireless LAN
>
> It is under Device Drivers -> Network device support -> Wireless LAN
> -> Ralink driver support

I forgot to mention - Under Networking Support -> Wireless, you need
to enable cfg80211 AND msc80211 (Generic IEEE 802.11 Netowrking Stack)

Then the Ralink driver support shows up under Wireless LAN

Re: using and auditing kernel config fragments

[Bruce Ashfield]

On Fri, Apr 6, 2012 at 5:34 AM, Tomas Frydrych
<tf+lists.yocto@r-finger.com> wrote:
> Hi,
>
> I am trying to add a kernel config fragment to the yocto 2.6.37 kernel
> for BeagleBoard, because I need a driver for a rt2800usb dongle.
>
> For some reason which I cannot work out, the rt2800usb options are
> removed (rather then disabled) from the yocto kernel config, i.e., if I
> run 'bitbake -c menuconfig linux-yocto', there is very little under
> Drivers->Net->WLAN. If I run menuconfig in the devshell, there are lots
> more WLAN drivers available, including the rt2800.
>
> So, I created custom fragment with the appropriate options, which works
> to the extent it gets picked up, but then the options are removed during
> the kernel_configme process and end up in the missing_required.cfg, and
> there is no information I can find anywhere in the logs as to why this
> is the case. Any ideas how to find out what the problem is?

If they end up in missing_required.cfg, it almost always means that a
dependency of the options listed in your fragment haven't been specified
and hence the option tossed out by lkc.

Looking via menuconfig or via the Kconfigs should show you what
the dependencies are, and your .config will show you what was specified
and ended up in the configuration. If dependencies are missing, add them
to your fragment .. and they should make it to the end.

Cheers,

Bruce

>
> (I am using yocto master)
>
> Tomas
> _______________________________________________
> yocto mailing list
> yocto@yoctoproject.org
> https://lists.yoctoproject.org/listinfo/yocto



-- 
"Thou shalt not follow the NULL pointer, for chaos and madness await
thee at its end"

Re: using and auditing kernel config fragments

[Tomas Frydrych]

On 06/04/12 14:40, Autif Khan wrote:
> I forgot to mention - Under Networking Support -> Wireless, you need
> to enable cfg80211 AND msc80211 (Generic IEEE 802.11 Netowrking Stack)
> 
> Then the Ralink driver support shows up under Wireless LAN

Thanks, that's the bit I was missing. :)

Tomas